10 Most Common Furnace Problems

10 Most Common Furnace Problems

Winter is just around the corner, but the cold weather has already had some very real impacts on many home and business owners. The furnace not working is perhaps the most prevalent of these problems, which can occur for a variety of reasons. Furnaces have the same basic issues whether they’re used in a commercial or residential context. You may take proactive efforts to avoid the most common furnace problems if you know what they are. We’ve listed the 10 most common furnace problems:

10 Most Common Furnace Problems

  1. Lack of maintenance: Failing to plan regular furnace maintenance and inspections, which might help you avoid costly breakdowns. These frequent inspections can aid in the appliance’s efficiency and dependability.
  2. Dirty filters: Filters that are dirty or clogged restrict circulation, making a furnace work harder to circulate the air. A blocked air filter might damage the limit switch, which controls the fan, in some cases.
  3. Wear and tear: Airflow issues, heat control issues, and even overheating can all be caused by normal wear and use.
  4. Electric ignition or pilot control problems: It may be difficult to heat a house or commercial space if the ignition or pilot is defective. An unlit pilot light might be caused by thermocouple issues, drafts, or obstructions in the appliance.
  5. Malfunctioning thermostat: Problems with the fan or comfort levels can be caused by a defective thermostat.
  6. Furnace doesn’t heat at all: A furnace that isn’t performing its primary function may have issues with the thermostat, power, gas, or pilot light.
  7. Furnace doesn’t heat enough: A furnace may not create enough heat if it is the improper size for the space, in addition to a clogged filter.
  8. Frequent cycling: Cycling between the “On” and “Off” modes may indicate a clogged filter, improper airflow or a bad thermostat setting.
  9. Blower continuously runs: Blower issues could be a sign of a problem with the limit switch, which a professional would need to replace.
  10. Furnace is too noisy: Rumbling, squeaking and rattles aren’t normal. The noises could suggest a mechanical issue, reduced airflow, or a clogged burner.

Tips & Advice

Change the air filters: Filters that are dirty lead to a multitude of furnace issues. Clean or replace the filter once a month, according to the manufacturer’s instructions. This can be demonstrated by a furnace repair professional.

Check the thermostat: Check the battery level in the thermostat if your furnace doesn’t seem to be producing any heat. In some cases, merely changing the battery will solve the problem.

7 signs you need a new thermostat

Check the thermostat settings if the blower fan does not switch off or the furnace cycles too frequently. The fan should be set to “Auto.” The fan will run constantly in the “On,” “Low,” “Medium,” or “High” modes.

If the furnace doesn’t seem to be producing enough heat, make sure the thermostat is set to “Heat” mode. Then double-check that the temperature is set to a higher setting than the current room temperature.

If nothing seems to be working, a new furnace may be required. If the replacement thermostat does not match the capabilities and capacity of your furnace, you may have future problems. 


  • Check the circuit breaker and power supply: Check if the circuit breaker tripped or a fuse blew if the furnace stops working or the thermostat’s screen goes blank. Check that the power cord is hooked into an outlet as well.
  • Reduce drafts: If a draft is causing problems with the pilot light, the room’s windows or doors may need to be closed.
  • Maintenance: Hire a furnace repair specialist to inspect and maintain the furnace once a year, towards the end of the summer or the beginning of the fall. The technician will prepare the unit for the forthcoming cold weather and address any issues that could lead to malfunctions or costly repairs during the busy winter months.
  • Furnace installation: If you need to replace your furnace, use a professional’s expertise to determine the right type and size for your home or commercial space.
  • Ignition control or pilot light problems: Ignition troubles should be left to the professionals because blocked components or malfunctioning electrical components might cause complications.
  • Mechanical issues: Allow specialists to tackle mechanical wear and tear issues unless you have acquired training to repair furnaces. Otherwise, you risk voiding the appliance’s warranty or inadvertently causing a bigger problem.
  • Natural gas or propane problems: Call a professional if you suspect a problem with the gas supply or valve as a result of a gas pressure regulator malfunction.

When to Leave It to The Experts

If troubleshooting your appliance doesn’t cure your furnace problems, call a professional contractor. Any furnace, regardless of age, could pose combustion or gas-related safety risks, so it’s always a good idea to have a professional inspect the unit and recommend the best course of action.

We’re always here for you. Need furnace repair or maintenance now? Call Big Fish HVAC at 512-653-1414.

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